diff --git a/examples/networking/simulation.py b/examples/networking/simulation.py
index aa9888dfac7f..2c6a0f3d6980 100644
--- a/examples/networking/simulation.py
+++ b/examples/networking/simulation.py
@@ -66,6 +66,7 @@ def _ns_add_ifc(self, name, ns_ifc, ifc_base_name=None, in_ifc=None,
 
         if out_ifc: out_ifc.up().commit()
         ns_ipdb.interfaces.lo.up().commit()
+        ns_ipdb.initdb()
         in_ifc = ns_ipdb.interfaces[in_ifname]
         with in_ifc as v:
             v.ifname = ns_ifc